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Properly make stacking contexts for inlines

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Instead of making a stacking context out of inline fragments parent
flow, make the inline fragment itself the stacking context. This fixes
positioning and rendering of these sort of fragments and prevents
over-layerization.

Fixes #7424.
Fixes #5812.
This commit is contained in:
Martin Robinson 2015-11-04 08:37:48 -08:00
parent fc98b8e126
commit d572f1ca05
4 changed files with 123 additions and 58 deletions
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129
components/layout/display_list_builder.rs
View file

@ -1738,51 +1738,89 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
}
pub trait InlineFlowDisplayListBuilding {
fn build_display_list_for_inline_fragment_at_index(&mut self,
index: usize,
display_list: &mut DisplayList,
layout_context: &LayoutContext);
fn build_display_list_for_inline(&mut self, layout_context: &LayoutContext);
}
impl InlineFlowDisplayListBuilding for InlineFlow {
fn build_display_list_for_inline_fragment_at_index(&mut self,
index: usize,
display_list: &mut DisplayList,
layout_context: &LayoutContext) {
let fragment = self.fragments.fragments.get_mut(index).unwrap();
fragment.build_display_list(display_list,
layout_context,
&self.base.stacking_relative_position,
&self.base
.early_absolute_position_info
.relative_containing_block_size,
self.base
.early_absolute_position_info
.relative_containing_block_mode,
BorderPaintingMode::Separate,
BackgroundAndBorderLevel::Content,
&self.base.clip,
&self.base.stacking_relative_position_of_display_port);
match fragment.specific {
SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
_ => {}
}
}
fn build_display_list_for_inline(&mut self, layout_context: &LayoutContext) {
// TODO(#228): Once we form lines and have their cached bounds, we can be smarter and
// not recurse on a line if nothing in it can intersect the dirty region.
debug!("Flow: building display list for {} inline fragments", self.fragments.len());
let mut display_list = box DisplayList::new();
let mut has_stacking_context = false;
for fragment in &mut self.fragments.fragments {
fragment.build_display_list(&mut *display_list,
layout_context,
&self.base.stacking_relative_position,
&self.base
.early_absolute_position_info
.relative_containing_block_size,
self.base
.early_absolute_position_info
.relative_containing_block_mode,
BorderPaintingMode::Separate,
BackgroundAndBorderLevel::Content,
&self.base.clip,
&self.base.stacking_relative_position_of_display_port);
has_stacking_context = fragment.establishes_stacking_context();
// We iterate using an index here, because we want to avoid doing a doing
// a double-borrow of self (one mutable for the method call and one immutable
// for the self.fragments.fragment iterator itself).
for index in (0..self.fragments.fragments.len()) {
let establishes_stacking_context = {
let fragment = self.fragments.fragments.get(index).unwrap();
match fragment.specific {
SpecificFragmentInfo::InlineBlock(_) |
SpecificFragmentInfo::InlineAbsoluteHypothetical(_) => false,
_ => fragment.establishes_stacking_context(),
}
};
match fragment.specific {
SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
_ => {}
if establishes_stacking_context {
let mut fragment_display_list = box DisplayList::new();
self.build_display_list_for_inline_fragment_at_index(index,
&mut *fragment_display_list,
layout_context);
let fragment = self.fragments.fragments.get(index).unwrap();
display_list.positioned_content.push_back(DisplayItem::StackingContextClass(
fragment.create_stacking_context(
&self.base,
fragment_display_list,
ScrollPolicy::Scrollable,
StackingContextCreationMode::Normal)));
} else {
self.build_display_list_for_inline_fragment_at_index(index,
&mut *display_list,
layout_context);
}
}
@ -1791,30 +1829,7 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
self.fragments.fragments[0].node);
}
// FIXME(Savago): fix Fragment::establishes_stacking_context() for absolute positioned item
// and remove the check for filter presence. Further details on #5812.
//
// FIXME(#7424, pcwalton): This is terribly bogus! What is even going on here?
if has_stacking_context {
match self.fragments.fragments[0].specific {
SpecificFragmentInfo::Canvas(_) | SpecificFragmentInfo::Iframe(_) => {}
_ => {
has_stacking_context =
!self.fragments.fragments[0].style().get_effects().filter.is_empty()
}
}
}
self.base.display_list_building_result = if has_stacking_context {
Some(DisplayList::new_with_stacking_context(
self.fragments.fragments[0].create_stacking_context(
&self.base,
display_list,
ScrollPolicy::Scrollable,
StackingContextCreationMode::Normal)))
} else {
Some(display_list)
};
self.base.display_list_building_result = Some(display_list);
if opts::get().validate_display_list_geometry {
self.base.validate_display_list_geometry();